Factors Affecting the Cardiac Cycle

MATERIALS NEEDED

textbook physiological recording apparatus such as a kymograph or Physiograph live frog dissecting tray dissecting instruments dissecting pins frog Ringer's solution in plastic squeeze bottle thread small hook medicine dropper thermometer ice hot plate calcium chloride, 2% solution potassium chloride, 5% solution

For Optional Activity:

epinephrine, 1:10,000 solution acetylcholine, 1:10,000 solution caffeine, 0.2% solution

..- . Virtual Physiology Lab: 4, Effects of Drugs on Ug&P the Frog Heart

SAFETY

Wear disposable gloves when handling the frogs. Dispose of the frogs according to your laboratory instructor.

Wash your hands before leaving the laboratory.

Although the cardiac cycle is controlled by the S-A node serving as the pacemaker, the rate of heart action can be altered by various other factors. These factors include parasympathetic and sympathetic nerve impulses that originate in the cardiac center of the medulla oblongata, changes in body temperature, and concentrations of certain ions.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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Responses

  • Dallas Jeffcoat
    What 7 factors affect the cardiac cycle?
    5 years ago

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